They all had the same ancestor and the tail must have got lost during the course of evolution in separate line but in parallel fashion. For instance, the absence of tail in man, great apes & gibbon.Yet, there are a number of basic differences between the two. They have independently developed a number of similar features so that people think of the two groups being the same. ![]() ![]() For example, the old & the new world monkey have developed from a common ancestor about 25 million years ago.Therefore, Parallelism is the situation where two evolutionary lines are derived from a common ancestor develop in some ways through centuries paralleling each other in adaptation & with both environmental & biological conditions working in tandem.The evolution of two related species in the same direction so that they resemble each other more than their common ancestor is called Parallelism.The marsupials have been diverted into different orders and species where each order gets diversified from its order Euaustralidelphia.Syllabus Section: 1.4 Human Evolution and the emergence of Man: Brief outline of terms and concepts of evolutionary biology. Marsupials are considered as one of the most commonly known examples for the adaptive radiation. Taking an account of Australian Marsupials which are all from a single ancestral stock from which various species has raised.īut according to the given geographical area, several adaptive radiations take place in various species, which gives rise to convergent evolution. Considering another example, where adaptive radiation is different from the development. In this case, lineage splits and radiates different characteristics.Ģ. Now these four children’s have a same parents and origin, and they four grow under the same circumstances and on growing each moved in different regions for the better opportunities.Īnd now, each of them has their own adaptations depending on their environmental conditions and the region they are living and their lifestyles. Let us consider a family consisting of about four children. ![]() In addition to the Galapagos Islands it can also be seen in Hawaiian archipelago along with its several volcanic islands and the relatively small area hosts a great number of plant and animal species are endemic, which means that they are evolved there and cannot be found anywhere.Īlmost 90% of the native species of Hawaii island including flowering plants, land mollusks, birds and insects are found to be endemic.ġ. Many types of examples for this type of radiation are mostly found in archipelagoes removed from the main land. Other examples that are includes such as Australian marsupials, cichlif fish, Darwin’s finches or Galapagos finches, etc. Adaptive radiation can also be defined as an evolutionary process in any of the groups either in plants or animals into a wide variety of types which are adapted to specialized modes of life.Īdaptive radiations are often seen in the closely related groups which has been evolved in a shorter period of time.Ī good example that can be sorted for adaptive radiation is in beginning of the Paleogenic era, approximately 66 million years ago of a basal stock of mammalian which are adapted for running, leaping, climbing, flying and swimming.
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